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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e658d6ac9e8c9e2633144261ba2398af812b8f6e0be1f421ed894cde1325716b' 
  AND token = 'LEAgcJCS13fO6DiNCIX2WTXEcNEv1V0FHbi4UjW463c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}